Copy tracking settings to selected trackers?
You can use the following script to copy a given set of properties from the active tracking marker to the selected markers.

Paste this into a text editor, modify the values at the top, and press Run Script to run it.

############################################################
# Define your constants here                               #
to_set   = ('color', 'hide')  # list of properties to set  #
mc_name  = 'SomeMovie.mp4'    # name of movie clip         #
obj_name = 'Camera'           # name of track              #
############################################################

clips  = bpy.data.movieclips
clip = clips[mc_name]
obj = clip.tracking.objects[obj_name]
tracks = obj.tracks

# find the active track
active = tracks.active

# define a set of attributes to change
new_values = { k : getattr(active, k) for k in to_set }

# loop through and assign
for track in tracks:
  if not track.select:
      continue
  for k, v in new_values.items():
    setattr(track, k, v)


You can use this API page to find the names of the properties you want to set.